mean, we have not been building them for 50 years. for example, in atlanta, only 35% of the people who want to live in urban communities that are walkable can afford -- can find them and afford to live them. it is described as the next great economic boom. they have to sell houses first; right? get out of the old house, but they would rather be in the city, and the ones of means, of course, have disposable income, no kids, exactly the kind of customers you want for your stores and part of your tax base in the city. joe courtright, also based in portland, has done a lot of research into what that means. he took walk score, based in seattle. do you know about walk score? raise your hand if you know about walk score. pretty much most of you. that rates each address in the world, i guess america, i don't know. it's google maps data in terms of walk about. joe did a study finding that -- depends what city you're in, but every walk score point is worth, on average, out of a hundred, worth $2,000. every point on a hundred-point scale, which figures in dc an empty lot in the city is worth $200